The second unused white wire source coil will not have the power to run a Dc circuit by itself. Have a look at the topics here on floating the earth if you truly want to run Dc power.
Essentially both source coils the white and yellow ones are earthed to the stator plate. These are connected and then run to a regulator rectifier which then with supply DC power.
You will need a battery or capacitor to store the power.
I would just be fixing the Ac circuits and running that. Simple and it works. I do not know where you got the idea that you need to disconnect earths from the frame. Many bikes use both ac and Dc circuits and share common earths with zero issues.
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Back on a gassy! 2018 EC300! 🤘
Txt 280 07 to make me feel like a gumby again
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